Plural of gurt, a dialectal or archaic term for great or coarse things, or possibly large swollen glands.
From Old English 'gyrt' or related to dialectal variants of 'great,' reflecting regional English variations where consonant clusters shifted over centuries.
The word 'gurt' lives on primarily in West Country English dialects (like in Somerset and Gloucestershire), where speakers still say 'gurt big' to mean 'really large'—it's a linguistic fossil showing how English developed regional personalities.
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